// Copyright (c) 2004-2009 Nokia Corporation and/or its subsidiary(-ies).

 // All rights reserved.

 // This component and the accompanying materials are made available

 // under the terms of the License "Symbian Foundation License v1.0" to Symbian Foundation members and "Symbian Foundation End User License Agreement v1.0" to non-members

 // which accompanies this distribution, and is available

 // at the URL "http://www.symbianfoundation.org/legal/licencesv10.html".

 //

 // Initial Contributors:

 // Nokia Corporation - initial contribution.

 //

 // Contributors:

 //

 // Description:

 // icmp6_hdr.h - ICMPv6 header structure

 // This module defines the basic classes for accessing the header

 // structures within ICMPv6 packets.

 //

 /**

  @file icmp6_hdr.h

  @ingroup ip_packet_formats

  @publishedAll

  @released

 */

 #ifndef __ICMP6_HDR_H__

 #define __ICMP6_HDR_H__

 #include <e32def.h>

 #include "in_hdr.h"

 #include <in_sock.h> // IPv6 enhanced in_sock.h

 /**

 * @addtogroup ip_packet_formats

 */

 //@{

 // TInet6HeaderICMP

 class TInet6HeaderICMP

 /**

 * ICMPv6 header common part layout.

 *

 * The basic ICMP header format only covers the common part (4 bytes)

 * and 4 bytes of the Message Body (can be accesses as "Parameter")

 @verbatim

 Extract from RFC-2462: General format of ICMP message

  0                   1                   2                   3

  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1

 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

 |     Type      |     Code      |          Checksum             |

 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

 |                                                               |

 +                         Message Body                          +

 |                                                               |

 @endverbatim

 * @publishedAll

 * @released

 */

 	{

 public:

 	inline TInt HeaderLength() const

 		/**

 		* Gets the header length.	

 		* 

 		* @note

 		*	This length is not the true length of the

 		*	ICMP header. This only covers the fixed part.

 		* 

 		* @return	Header length.

 		*/

 		{return 4;}

 	inline static TInt MinHeaderLength()

 		/**

 		* Gets the minimum header length.

 		* 

 		* @return	Minimum header length

 		*/

 		{return 4; }

 	inline static TInt MaxHeaderLength()

 		/**

 		* Gets the maximum header length.

 		* 

 		* @note

 		*	This length is not the true length of the

 		*	ICMP header. This only covers the fixed part.

 		* 

 		* @return	Maximum header length

 		*/

 		{return 4; }

 	inline TUint8 *EndPtr() const

 		/**

 		* Gets a pointer to the byte following the header.

 		* 

 		* @return

 		*	Pointer to the byte following the minimum

 		*	fixed header

 		*/

 		{return (TUint8 *)i + HeaderLength();}

 	//

 	// Access, get ICMP header field values from the packet

 	//

 	inline TUint8 Type() const

 		/**

 		* Gets the ICMPv6 type from the header.

 		* @return ICMPv6 type [0..255]

 		*/

 		{

 		return i[0];

 		}

 	inline TUint8 Code() const

 		/**

 		* Gets the ICMPv6 code from the header.

 		* @return ICMPv6 code [0..255]

 		*/

 		{

 		return i[1];

 		}

 	inline TInt Checksum() const

 		/**

 		* Gets the Checksum from the header.

 		* @return Header Checksum (TUint16 in NETWORK byte order)

 		*/

 		{

 		// Checksum is used in network byte order

 		return *((TUint16 *)&i[2]);

 		}

 	inline TUint32 Parameter() const

 		/**

 		* Gets the ICMPv6 Parameter.

 		*

 		* Accesses the first 4 bytes of ICMP message body, and assumes

 		* they form a 32 bit integer in network byte order. Returns

 		* this integer in host order.

 		*

 		* @return ICMPv6 Parameter (as an integer)

 		*/

 		{

 		return (i[4] << 24) | (i[5] << 16) | (i[6] << 8) | i[7];

 		}

 	//

 	// Build, set IP header field values into the packet

 	//

 	inline void SetType(TUint8 aType)

 		/**

 		* Sets the ICMPv6 type.

 		* @param aType ICMPv6 type [0..255]

 		*/

 		{

 		i[0] = aType;

 		}

 	inline void SetCode(TUint8 aCode)

 		/**

 		* Sets the ICMPv6 code.

 		* @param aCode ICMPv6 code [0..255]

 		*/

 		{

 		i[1] = aCode;

 		}

 	inline void SetChecksum(TInt aSum)

 		/**

 		* Sets the Checksum.

 		*

 		* @param aSum

 		*	The Checksum [0..65535] (16 least significant bits

 		*	stored as is (assumed to be in NETWORK byte order).					

 		*/

 		{

 		*((TUint16 *)&i[2]) = (TUint16)aSum;

 		}

 	inline void SetParameter(TUint32 aValue)

 		/**

 		* Sets the ICMPv6 Parameter.

 		*

 		* The value is converted into network byte order and

 		* stored as the first 4 bytes of the ICMP message body.

 		*

 		* @param aValue

 		*	The parameter.

 		*/

 		{

 		i[7] = (TUint8)aValue;

 		i[6] = (TUint8)(aValue >> 8);

 		i[5] = (TUint8)(aValue >> 16);

 		i[4] = (TUint8)(aValue >> 24);

 		}

 protected:

 	union

 		{

 		TUint8 i[8];

 		TUint32 iAlign;	// A dummy member to force the 4 byte alignment

 		};

 	};

 //

 // TInet6HeaderICMP_Echo

 //

 class TInet6HeaderICMP_Echo : public TInet6HeaderICMP

 /**

 * ICMPv6 Echo Request and Echo Reply layout.

 *

 * Describes the ICMP Echo Request and Replay layout. The space for

 * Identifier and Sequence is already covered by the base class.

 *

 @verbatim

 RFC-2463:

  0                   1                   2                   3

  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1

 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

 |     Type      |     Code      |          Checksum             |

 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

 |           Identifier          |        Sequence Number        |

 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

 |     Data ...

 +-+-+-+-+-

 @endverbatim

 @publishedAll

 @released

 */

 	{

 public:

 	//

 	// General

 	//

 	inline TInt HeaderLength() const

 		/**

 		* Gets the header length.

 		* @return The length

 		*/

 		{return 8;}

 	inline static TInt MinHeaderLength()

 		/**

 		* Gets the minimum header length.	

 		* @return The length

 		*/

 		{return 8; }

 	inline static TInt MaxHeaderLength()

 		/**

 		* Gets the maximum header length.	

 		* @return The length

 		*/

 		{return 8; }

 	//

 	// Access, get ICMP header field values from the packet

 	//

 	inline TInt Identifier() const

 		/**

 		* Gets the Idenfifier

 		* @return The Identifier

 		*/

 		{

 		return (i[4] << 8) + i[5];

 		}

 	inline TInt Sequence() const

 		/**

 		* Gets the Sequence Number

 		* @return The number

 		*/

 		{

 		return (i[6] << 8) + i[7];

 		}

 	//

 	// Build, set IP header field values into the packet

 	//

 	inline void SetIdentifier(TUint16 aIdentifier)

 		/**

 		* Sets the Idenfifier

 		* @param aIdentifier The Identifier

 		*/

 		{

 		i[4] = (TUint8)(aIdentifier >> 8);

 		i[5] = (TUint8)aIdentifier;

 		}

 	inline void SetSequence(TUint16 aSequence)

 		/**

 		* Sets the Sequence Number

 		* @param aSequence The number

 		*/

 		{

 		i[6] = (TUint8)(aSequence >> 8);

 		i[7] = (TUint8)aSequence;

 		}

 private:

 	};

 class TInet6HeaderICMP_RouterSol: public TInet6HeaderICMP

 /**

 * ICMPv6 Router Solicitation layout.

 *

 @verbatim

 Router Solicitation Message Format (from RFC-2461)

  0                   1                   2                   3

  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1

 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

 |     Type      |     Code      |          Checksum             |

 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

 |                            Reserved                           |

 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

 |   Options ...

 +-+-+-+-+-+-+-+-+-+-+-+-

 @endverbatim

 * Aside from the fields provided by the base class, there is nothing

 * else here.

 *

 * Valid options:

 *

 * - #KInet6OptionICMP_SourceLink

 *

 * @publishedAll

 * @released

 */

 	{

 public:

 	inline static TInt MinHeaderLength() {return 8; }

 	inline static TInt MaxHeaderLength() {return 8; }

 	inline TInt HeaderLength() const {return 8;}

 	};

 // Router Advertisement Message Format from RFC-2461

 class TInet6HeaderICMP_RouterAdv : public TInet6HeaderICMP

 /**

 * ICMPv6 Router Advertisement layout.

 *

 * (Neighbour Discovery for IP version 6)

 * (+ Home Agent flag from draft-ietf-mobileip-ipv6-08)

 @verbatim

 Type=134, Code=0

  0                   1                   2                   3

  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1

 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

 |     Type      |     Code      |          Checksum             |

 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

 | Cur Hop Limit |M|O|H|Prf|Rsrvd|       Router Lifetime         |

 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

 |                         Reachable Time                        |

 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

 |                          Retrans Timer                        |

 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

 |   Options ...

 +-+-+-+-+-+-+-+-+-+-+-+-

 @endverbatim

 *

 * @note

 *	Above is longer thant what is declared in the base class

 *	i-member. The user must verify the sufficient length of

 *	the packet, when using this.

 *

 * Valid options:

 *

 * - #KInet6OptionICMP_SourceLink

 * - #KInet6OptionICMP_Mtu

 * - #KInet6OptionICMP_Prefix

 * - #KInet6OptionICMP_RouteInformation (draft)

 *

 * @publishedAll

 * @released

 */

 	{

 public:

 	//

 	// General

 	//

 	inline static TInt MinHeaderLength() {return 16; }

 	inline static TInt MaxHeaderLength() {return 16; }

 	inline TInt HeaderLength() const {return 16;}

 	//

 	// Access, get ICMP header field values from the packet

 	//

 	inline TInt CurHopLimit() const

 		/**

 		* Gets Cur Hop Limit.

 		* @return Hop Limit

 		*/

 		{

 		return i[4];

 		}

 	inline TInt Flags() const

 		/**

 		* Gets flags byte

 		* @return Flags (M, O, H, Prf and Rsrvd)

 		*/

 		{

 		return i[5];		// M + O + Reserved as one unit

 		}

 	inline TInt M() const

 		/** Gets Managed Address Configuration (M) flag */

 		{

 		return i[5] & 0x80;

 		}

 	inline TInt O() const

 		/** Gets Other Address Configuartion (O) flag */

 		{

 		return i[5] & 0x40;

 		}

 	inline TInt H() const

 		/** Gets Home Agent Configuration (H) flag */

 		{

 		return i[5] & 0x20;

 		}

 #if 1

 	inline TInt Prf() const

 		/**

 		* Gets default route preference.

 		*

 		* Experimental: draft-draves-ipngwg-router-selection-01.txt

 		* Default Router Preferences and More-Specific Routes

 		*/

 		{

 		return (i[5] >> 3) & 0x3;	// should be treated as 2bit signed int

 		}

 #endif

 	inline TInt RouterLifetime() const

 		/**

 		* Gets the lifetime of the defaul route.

 		*

 		* If non-zero, specifies how long (in seconds) this

 		* router is willing to act as a default router.

 		*

 		* @return The life time of the default route.

 		*

 		* @note

 		*	This is badly named. The parameter controls

 		*	only the default route processing. The value

 		*	ZERO does not mean that the sender is not a

 		*	router.

 		*/

 		{

 		return (i[6] << 8) + i[7];

 		}

 	inline TUint32 ReachableTime() const

 		/**

 		* Gets the value of reachable timer.

 		*/

 		{

 		return (i[8] << 24) | (i[9] << 16) | (i[10] << 8) | i[11];

 		}

 	inline TUint32 RetransTimer() const

 		/**

 		* Gets the value of retransmit timer.

 		*/

 		{

 		return (i[12] << 24) | (i[13] << 16) | (i[14] << 8) | i[15];

 		}

 	//

 	// Build, set IP header field values into the packet

 	//

 	inline void SetCurHopLimit(TInt aLimit)

 		/**

 		* Sets the Cur Hoplimit.

 		* @param	aLimit	The Hoplimit [0..255]

 		*/

 		{

 		i[4] = (TUint8)aLimit;

 		}

 	inline void SetFlags(TInt aFlags)

 		/**

 		* Sets the flags.

 		* @param	aFlags	The flags bits [0..255].

 		*/

 		{

 		i[5] = (TUint8)aFlags;

 		}

 	inline void SetRouterLifetime(TInt aTime)

 		/**

 		* Sets the lifetime of the default route.

 		* @param aTime The lifetime.

 		*/

 		{

 		i[7] = (TUint8)aTime;

 		i[6] = (TUint8)(aTime >> 8);

 		}

 	inline void SetReachableTime(TUint32 aTime)

 		/**

 		* Sets the value of reachable timer

 		* @param aTime The timer value

 		*/

 		{

 		i[11] = (TUint8)aTime;

 		i[10] = (TUint8)(aTime >> 8);

 		i[9] = (TUint8)(aTime >> 16);

 		i[8] = (TUint8)(aTime >> 24);

 		}

 	inline void SetRetransTimer(TUint32 aTimer)

 		/**

 		* Sets the value of the retransmit timer

 		* @param aTimer The timer value

 		*/

 		{

 		i[15] = (TUint8)aTimer;

 		i[14] = (TUint8)(aTimer >> 8);

 		i[13] = (TUint8)(aTimer >> 16);

 		i[12] = (TUint8)(aTimer >> 24);

 		}

 private:

 	};

 class TInet6HeaderICMP_NeighborSol : public TInet6HeaderICMP

 /**

 * ICMPv6 Neighbour Solicitation layout.

 @verbatim

 Neigbour Solicitation Message Format from RFC-2461

  0                   1                   2                   3

  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1

 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

 |     Type      |     Code      |          Checksum             |

 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

 |                           Reserved                            |

 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

 |                                                               |

 +                                                               +

 |                                                               |

 +                       Target Address                          +

 |                                                               |

 +                                                               +

 |                                                               |

 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

 |   Options ...

 +-+-+-+-+-+-+-+-+-+-+-+-

 @endverbatim

 *

 * @note

 *	Above is longer thant what is declared in the base class

 *	i-member. The user must verify the sufficient length of

 *	the packet, when using this.

 *

 * Valid options:

 *

 * - #KInet6OptionICMP_SourceLink

 *

 * @publishedAll

 * @released

 */

 	{

 public:

 	//

 	// General

 	//

 	inline static TInt MinHeaderLength() {return 24; }

 	inline static TInt MaxHeaderLength() {return 24; }

 	inline TInt HeaderLength() const {return 24;}

 	inline TIp6Addr &Target() const

 		/**

 		* Gets the Target Address.

 		*

 		* @return The target address (reference).

 		*/

 		{

 		return (TIp6Addr &)i[8];

 		}

 private:

 	};

 class TInet6HeaderICMP_NeighborAdv : public TInet6HeaderICMP

 /**

 * ICMPv6 Neighbour Advertisement layout.

 @verbatim

 Neighbor Advertisement Message Format (from RFC-2461)

  0                   1                   2                   3

  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1

 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

 |     Type      |     Code      |          Checksum             |

 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

 |R|S|O|                     Reserved                            |

 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

 |                                                               |

 +                                                               +

 |                                                               |

 +                       Target Address                          +

 |                                                               |

 +                                                               +

 |                                                               |

 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

 |   Options ...

 +-+-+-+-+-+-+-+-+-+-+-+-

 @endverbatim

 * @note

 *	Above is longer thant what is declared in the base class

 *	i-member. The user must verify the sufficient length of

 *	the packet, when using this.

 *

 * Valid options:

 *

 * - #KInet6OptionICMP_TargetLink

 *

 * @publishedAll

 * @released

 */

 	{

 public:

 	//

 	// General

 	//

 	inline static TInt MinHeaderLength() {return 24; }

 	inline static TInt MaxHeaderLength() {return 24; }

 	inline TInt HeaderLength() const {return 24;}

 	//

 	// Set and Access the Target Address

 	//

 	inline TIp6Addr &Target() const

 		/**

 		* Gets the Target Address.

 		*

 		* @return The target address (reference).

 		*/

 		{

 		return (TIp6Addr &)i[8];

 		}

 	inline TInt R()

 		{

 		return 0x80 & i[4];

 		}

 	inline TInt S()

 		{

 		return 0x40 & i[4];

 		}

 	inline TInt O()

 		{

 		return 0x20 & i[4];

 		}

 	inline void SetR(TInt aValue)

 		{

 		if (aValue) i[4] |= 0x80; else i[4] &= ~0x80;

 		}

 	inline void SetS(TInt aValue)

 		{

 		if (aValue) i[4] |= 0x40; else i[4] &= ~0x40;

 		}

 	inline void SetO(TInt aValue)

 		{

 		if (aValue) i[4] |= 0x20; else i[4] &= ~0x20;

 		}

 	};

 class TInet6HeaderICMP_Redirect : public TInet6HeaderICMP

 /**

 * ICMPv6 Redirect layout.

 @verbatim

 Redirect Message Format (RFC-2461)

  0                   1                   2                   3

  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1

 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

 |     Type      |     Code      |          Checksum             |

 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

 |                           Reserved                            |

 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

 |                                                               |

 +                                                               +

 |                                                               |

 +                       Target Address                          +

 |                                                               |

 +                                                               +

 |                                                               |

 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

 |                                                               |

 +                                                               +

 |                                                               |

 +                     Destination Address                       +

 |                                                               |

 +                                                               +

 |                                                               |

 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

 |   Options ...

 +-+-+-+-+-+-+-+-+-+-+-+-

 @endverbatim

 * @note

 *	Above is longer thant what is declared in the base class

 *	i-member. The user must verify the sufficient length of

 *	the packet, when using this.

 *

 * Valid options:

 *

 * - #KInet6OptionICMP_TargetLink

 * - #KInet6OptionICMP_Redirect

 *

 * @publishedAll

 * @released

 */

 	{

 public:

 	//

 	// General

 	//

 	inline static TInt MinHeaderLength() {return 40; }

 	inline static TInt MaxHeaderLength() {return 40; }

 	inline TInt HeaderLength() const {return 40;}

 	inline TIp6Addr &Target() const

 		/**

 		* Gets the Target Address.

 		*

 		* @return The target address (reference).

 		*/

 		{

 		return (TIp6Addr &)i[8];

 		}

 	inline TIp6Addr &Destination() const

 		/**

 		* Gets the Destination Address.

 		*

 		* @return The destination address (reference).

 		*/

 		{

 		return (TIp6Addr &)i[24];

 		}

 	};

 class TInet6OptionICMP_LinkLayer

 /**

 * ICMPv6 Link-layer Address layout.

 @verbatim

 Source/Target Link-layer Address Option (RFC-2461)

  0                   1                   2                   3

  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1

 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

 |     Type      |    Length     |    Link-Layer Address ...

 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

 @endverbatim

 * @publishedAll

 * @released

 */

 	{

 public:

 	inline static TInt MinHeaderLength() {return 8; }

 	inline static TInt MaxHeaderLength() {return 8; }	// Not very useful

 	inline TInt HeaderLength() const {return Length() * 8; }

 	//

 	// Access

 	//

 	inline TInt Type() const

 		{

 		return i[0];

 		}

 	inline TInt Length() const

 		{

 		return i[1];

 		}

 	//

 	// Access and Set

 	//

 	inline TPtr8 Address() const

 		{

 		return TPtr8((TUint8 *)&i[2], i[1] * 8 - 2, i[1] * 8 - 2);

 		}

 	//

 	// Construct methods

 	//

 	inline void SetType(TInt aType)

 		{

 		i[0] = (TUint8)aType;

 		}

 	inline void SetLength(TInt aLength)

 		{

 		i[1] = (TUint8)aLength;

 		}

 private:

 	union

 		{

 		TUint8 i[8];

 		TUint32 iAlign;	// A dummy member to force the 4 byte alignment

 		};

 	};

 class TInet6OptionICMP_Prefix

 /**

 * ICMPv6 Prefix Infotmation Option.

 @verbatim

 Prefix Information Option (RFC-2461)

 (+ Router Address flag from draft-ietf-mobileip-ipv6-08)

  0                   1                   2                   3

  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1

 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

 |     Type      |    Length     | Prefix Length |L|A|R| Rsrvd1  |

 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

 |                         Valid Lifetime                        |

 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

 |                       Preferred Lifetime                      |

 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

 |                           Reserved2                           |

 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

 |                                                               |

 +                                                               +

 |                                                               |

 +                            Prefix                             +

 |                                                               |

 +                                                               +

 |                                                               |

 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

 @endverbatim

 * @publishedAll

 * @released

 */

 	{

 public:

 	inline static TInt MinHeaderLength() {return 4*8; }

 	inline static TInt MaxHeaderLength() {return 4*8; }	// Not very useful

 	inline TInt HeaderLength() const {return 4*8; }

 	inline TInt Type() const

 		{

 		return i[0];

 		}

 	inline TInt Length() const

 		{

 		return i[1];

 		}

 	inline TInt PrefixLength() const

 		{

 		return i[2];	// 0..128

 		}

 	inline TInt LFlag() const

 		{

 		return i[3] & 0x80;

 		}

 	inline TInt AFlag() const

 		{

 		return i[3] & 0x40;

 		}

 	inline TInt RFlag() const

 		{

 		return i[3] & 0x20;

 		}

 	inline TUint32 ValidLifetime() const

 		{

 		return (i[4] << 24) | (i[5] << 16) | (i[6] << 8) | i[7];

 		}

 	inline TUint32 PreferredLifetime() const

 		{

 		return (i[8] << 24) | (i[9] << 16) | (i[10] << 8) | i[11];

 		}

 	//

 	//

 	inline TIp6Addr &Prefix() const

 		{

 		return (TIp6Addr &)i[16];

 		}

 	//

 	// Construct methods

 	//

 	inline void SetType(TInt aType)

 		{

 		i[0] = (TUint8)aType;

 		}

 	inline void SetLength(TInt aLength)

 		{

 		i[1] = (TUint8)aLength;

 		}

 	inline void SetPrefixLength(TInt aLength)

 		{

 		i[2] = (TUint8)aLength;

 		}

 	inline void SetFlags(TInt aFlags)

 		{

 		i[3] = (TUint8)aFlags;

 		}

 	inline void SetValidLifetime(TUint32 aTime)

 		{

 		i[7] = (TUint8)aTime;

 		i[6] = (TUint8)(aTime >> 8);

 		i[5] = (TUint8)(aTime >> 16);

 		i[4] = (TUint8)(aTime >> 24);

 		}

 	inline void SetPreferredLifetime(TUint32 aTime)

 		{

 		i[11] = (TUint8)aTime;

 		i[10] = (TUint8)(aTime >> 8);

 		i[9] = (TUint8)(aTime >> 16);

 		i[8] = (TUint8)(aTime >> 24);

 		}

 	inline void SetReserved2(TUint32 aFiller)

 		{

 		i[15] = (TUint8)aFiller;

 		i[14] = (TUint8)(aFiller >> 8);

 		i[13] = (TUint8)(aFiller >> 16);

 		i[12] = (TUint8)(aFiller >> 24);

 		}

 private:

 	union

 		{

 		TUint8 i[4*8];

 		TUint32 iAlign;	// A dummy member to force the 4 byte alignment

 		};

 	};

 class TInet6OptionICMP_Mtu

 /**

 * ICMPv6 MTU Option.

 @verbatim

 MTU Option (RFC-2461)

  0                   1                   2                   3

  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1

 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

 |     Type      |    Length     |           Reserved            |

 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

 |                              MTU                              |

 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

 @endverbatim

 * @publishedAll

 * @released

 */

 	{

 public:

 	inline static TInt MinHeaderLength() {return 8; }

 	inline static TInt MaxHeaderLength() {return 8; }	// Not very useful

 	inline TInt HeaderLength() const {return 8; }

 	inline TInt Type() const

 		{

 		return i[0];

 		}

 	inline TInt Length() const

 		{

 		return i[1];

 		}

 	inline TInt Mtu() const

 		{

 		return (i[4] << 24) | (i[5] << 16) | (i[6] << 8) | i[7];

 		}

 	//

 	// Construct methods

 	//

 	inline void SetType(TInt aType)

 		{

 		i[0] = (TUint8)aType;

 		}

 	inline void SetLength(TInt aLength)

 		{

 		i[1] = (TUint8)aLength;

 		// Silently ZERO the reserved bits... not too nice --- msa

 		i[2] = 0;

 		i[3] = 0;

 		}

 	inline void SetMtu(TUint32 aMtu)

 		{

 		i[7] = (TUint8)aMtu;

 		i[6] = (TUint8)(aMtu >> 8);

 		i[5] = (TUint8)(aMtu >> 16);

 		i[4] = (TUint8)(aMtu >> 24);

 		}

 private:

 	TUint8 i[8];

 	};

 #if 1

 class TInet6OptionICMP_RouteInformation

 // Route Information Option 

 // Experimental: draft-draves-ipngwg-router-selection-01.txt

 /**

 *  ICMPv6 Route Information Option.

 @verbatim

 Default Router Preferences and More-Specific Routes

  0                   1                   2                   3 

  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 

 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 

 |     Type      |    Length     | Prefix Length |Resvd|Prf|Resvd| 

 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 

 |                        Route Lifetime                         | 

 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 

 |                                                               | 

 +                                                               + 

 |                                                               | 

 +                            Prefix                             + 

 |                                                               | 

 +                                                               + 

 |                                                               | 

 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 

 @endverbatim

 * @publishedAll

 * @released

 */

 	{

 public:

 	inline static TInt MinHeaderLength() {return 8; }

 	inline static TInt MaxHeaderLength() {return 3*8; }

 	inline TInt HeaderLength() const {return Length()*8; }

 	inline TInt Type() const

 		{

 		return i[0];

 		}

 	inline TInt Length() const

 		{

 		return i[1];

 		}

 	inline TInt PrefixLength() const

 		{

 		return i[2];	// 0..128

 		}

 	inline TInt Prf() const

 		{

 		return (i[3] >> 3) & 0x3;	// should be treated as 2bit signed int

 		}

 	inline TUint32 RouteLifetime() const

 		{

 		return (i[4] << 24) | (i[5] << 16) | (i[6] << 8) | i[7];

 		}

 	//

 	// *WARNING* The "Prefix" returns a raw reference to the beginning

 	// of the prefix field in the option structure. HOWEVER, the option

 	// field can be shorter than 128 bits! If used to allocate space,

 	// the maximum is allocated and the method is safe, but that is not

 	// true if header is mapped directly to the received packet! -- msa

 	inline TIp6Addr &Prefix() const

 		{

 		return (TIp6Addr &)i[8];

 		}

 	//

 	// Construct methods

 	//

 	inline void SetType(TInt aType)

 		{

 		i[0] = (TUint8)aType;

 		}

 	inline void SetLength(TInt aLength)

 		{

 		i[1] = (TUint8)aLength;

 		}

 	inline void SetPrefixLength(TInt aLength)

 		{

 		i[2] = (TUint8)aLength;

 		}

 	inline void SetPrefixLifetime(TUint32 aTime)

 		{

 		i[7] = (TUint8)aTime;

 		i[6] = (TUint8)(aTime >> 8);

 		i[5] = (TUint8)(aTime >> 16);

 		i[4] = (TUint8)(aTime >> 24);

 		}

 private:

 	union

 		{

 		TUint8 i[3*8];	// The space allocated for MAX LENGTH

 		TUint32 iAlign;	// A dummy member to force the 4 byte alignment

 		};

 	};

 class TInet6OptionICMP_DnsInformation

 /**

 *  ICMPv6 Recursive DNS Server Option.

 * IPv6 DNS Configuration based on Router Advertisement

 *

 * Experimental: draft-jeong-dnsop-ipv6-discovery-03.txt

 @verbatim

 Recursive DNS Server Option

  0                   1                   2                   3

  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1

 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

 |     Type      |     Length    |  Pref |        Reserved       |

 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

 |                           Lifetime                            |

 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

 |                                                               |

 :                     IPv6 Address of RDNSS                     :

 |                                                               |

 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

 @endverbatim

 * @publishedAll

 * @released

 */

 	{

 public:

 	inline static TInt MinHeaderLength() {return 24; }

 	inline static TInt MaxHeaderLength() {return 24; }

 	inline TInt HeaderLength() const {return Length()*8; }

 	inline TInt Type() const

 		{

 		return i[0];

 		}

 	inline TInt Length() const

 		{

 		return i[1];

 		}

 	inline TInt Pref() const

 		{

 		return (i[3] >> 4) & 0xF;

 		}

 	inline TUint32 Lifetime() const

 		{

 		return (i[4] << 24) | (i[5] << 16) | (i[6] << 8) | i[7];

 		}

 	inline TIp6Addr &Address() const

 		{

 		return (TIp6Addr &)i[8];

 		}

 	//

 	// Construct methods

 	//

 	inline void SetType(TInt aType)

 		{

 		i[0] = (TUint8)aType;

 		}

 	inline void SetLength(TInt aLength)

 		{

 		i[1] = (TUint8)aLength;

 		}

 	inline void SetPref(TInt aPref)

 		{

 		i[2] = (TUint8)(((aPref << 4) & 0xF0) | (i[2] & 0xF));

 		}

 	inline void SetLifetime(TUint32 aTime)

 		{

 		i[7] = (TUint8)aTime;

 		i[6] = (TUint8)(aTime >> 8);

 		i[5] = (TUint8)(aTime >> 16);

 		i[4] = (TUint8)(aTime >> 24);

 		}

 private:

 	union

 		{

 		TUint8 i[24];	// The space allocated for MAX LENGTH

 		TUint32 iAlign;	// A dummy member to force the 4 byte alignment

 		};

 	};

 #endif

 /**

 * @name ICMPv6 Error Message Types (0-127)

 */

 //@{

 const TUint8 KInet6ICMP_Unreachable		= 1;

 const TUint8 KInet6ICMP_PacketTooBig	= 2;

 const TUint8 KInet6ICMP_TimeExceeded	= 3;

 const TUint8 KInet6ICMP_ParameterProblem= 4;

 //@}

 /**

 * @name ICMPv6 Informational Message Types (128-255)

 */

 //@{

 /** Echo Request. See TInet6HeaderICMP_Echo. */

 const TUint8 KInet6ICMP_EchoRequest		= 128;

 /** Echo Reply. See TInet6HeaderICMP_Echo. */

 const TUint8 KInet6ICMP_EchoReply		= 129;

 /** Not implemented. */

 const TUint8 KInet6ICMP_GroupQuery		= 130;

 /** Not implemented. */

 const TUint8 KInet6ICMP_GroupReport		= 131;

 /** Not implemented. */

 const TUint8 KInet6ICMP_GroupDone		= 132;

 /** Router Solicitation. See TInet6HeaderICMP_RouterSol. */

 const TUint8 KInet6ICMP_RouterSol		= 133;

 /** Router Advertisement. See TInet6HeaderICMP_RouterAdv. */

 const TUint8 KInet6ICMP_RouterAdv		= 134;

 /** Neighbor Solicitation. See TInet6HeaderICMP_NeighborSol. */

 const TUint8 KInet6ICMP_NeighborSol		= 135;

 /** Neighbor Advertisement. See TInet6HeaderICMP_NeighborAdv. */

 const TUint8 KInet6ICMP_NeighborAdv		= 136;

 /** Redirect. See TInet6HeaderICMP_Redirect. */

 const TUint8 KInet6ICMP_Redirect		= 137;

 //@}

 /**

 * @name ICMPv6 Option types.

 * The default derivation of the symbol

 * is from the name of the header class by replacing 'T' with 'K' (or

 * vice versa).

 *

 */

 //@{

 /** Source Link-Layer Address. See TInet6OptionICMP_LinkLayer. */

 const TInt KInet6OptionICMP_SourceLink	= 1;

 /** Target Link-Layer Address. See TInet6OptionICMP_LinkLayer. */

 const TInt KInet6OptionICMP_TargetLink	= 2;

 /** Prefix Information. See TInet6OptionICMP_Prefix. */

 const TInt KInet6OptionICMP_Prefix		= 3;

 /** Redirect Header. (not implemented). */

 const TInt KInet6OptionICMP_Redirect	= 4;

 /** MTU.  See TInet6OptionICMP_Mtu. */

 const TInt KInet6OptionICMP_Mtu			= 5;

 #if 1

 	// Experimental: draft-draves-ipngwg-router-selection-01.txt

 	// Default Router Preferences and More-Specific Routes

 	// *UNOFFICIAL NUMBER ASSIGNMENT (SAME AS MSR STACK)--REAL VALUE TBD*

 /** Route Information. See TInet6OptionICMP_RouteInformation. */

 const TInt KInet6OptionICMP_RouteInformation = 9;

 #endif

 //@}

 //@}

 #endif